#ifndef STRINGSOURCE_H_62B23520_7C8E_11DE_8A39_0800200C9A66
#define STRINGSOURCE_H_62B23520_7C8E_11DE_8A39_0800200C9A66

#if defined(_MSC_VER) ||                                            \
    (defined(__GNUC__) && (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || \
     (__GNUC__ >= 4)) // GCC supports "pragma once" correctly since 3.4
#pragma once
#endif

#include <cstddef>

namespace YAML {
class StringCharSource {
public:
    StringCharSource(const char* str, std::size_t size)
        : m_str(str), m_size(size), m_offset(0) {}

    operator bool() const { return m_offset < m_size; }
    char operator[](std::size_t i) const { return m_str[m_offset + i]; }
    bool operator!() const { return !static_cast<bool>(*this); }

    const StringCharSource operator+(int i) const {
        StringCharSource source(*this);
        if (static_cast<int>(source.m_offset) + i >= 0)
            source.m_offset += i;
        else
            source.m_offset = 0;
        return source;
    }

    StringCharSource& operator++() {
        ++m_offset;
        return *this;
    }

    StringCharSource& operator+=(std::size_t offset) {
        m_offset += offset;
        return *this;
    }

private:
    const char* m_str;
    std::size_t m_size;
    std::size_t m_offset;
};
} // namespace YAML

#endif // STRINGSOURCE_H_62B23520_7C8E_11DE_8A39_0800200C9A66
